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Proceedings Paper

Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO
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Paper Abstract

HARMONI is a visible and near-infrared integral field spectrograph designed to be a first-light instrument on the European extremely large telescope. It will use both single-conjugate and laser tomographic adaptive optics to fully exploit high-performance and sky coverage. Using a fast AO modelling toolbox, we simulate anisoplanatism effects on the point spread function of the single-conjugate adaptive optics of HARMONI. We investigate the degradation of the correction performance with respect to the off-axis distance in terms of Strehl ratio and ensquared energy. In addition, we analyse what impact the natural guide source magnitude, AO sampling frequency and number of sub-apertures have on performance.

We show, in addition to the expected PSF degradation with the field direction, that the PSF retains a coherent core even at large off-axis distances. We demonstrated the large performance improvement of fine tuning the sampling frequency for dimer natural guide stars and an improvement of approx. 50% in SR can be reached above the nominal case. We show that using a smaller AO system with only 20x20 sub-apertures it is possible to further increase performance and maintain equivalent performance even for large off-axis angles.

Paper Details

Date Published: 27 July 2016
PDF: 10 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 990978 (27 July 2016); doi: 10.1117/12.2231291
Show Author Affiliations
Noah Schwartz, UK Astronomy Technology Ctr. (United Kingdom)
Jean-François Sauvage, ONERA (France)
Aix Marseille Univ., CNRS, LAM (France)
Carlos Correia, Aix Marseille Univ., CNRS, LAM (France)
Benoît Neichel, Aix Marseille Univ., CNRS, LAM (France)
Léonardo Blanco, Aix Marseille Univ., CNRS, LAM (France)
Thierry Fusco, ONERA (France)
Aix Marseille Univ., CNRS, LAM (France)
Arlette Pécontal-Rousset, Univ. Lyon 1, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
Aurélien Jarno, Univ. Lyon 1, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
Laure Piqueras, Univ. Lyon 1, CNRS, Ctr. de Recherche Astrophysique de Lyon (France)
Kjetil Dohlen, Aix Marseille Univ., CNRS, LAM (France)
Kacem El Hadi, Aix Marseille Univ., CNRS, LAM (France)
Niranjan Thatte, Univ. of Oxford (United Kingdom)
Ian Bryson, UK Astronomy Technology Ctr. (United Kingdom)
Fraser Clarke, Univ. of Oxford (United Kingdom)
Hermine Schnetler, UK Astronomy Technology Ctr. (United Kingdom)


Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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